斯卡拉 – 如何看远程Akka演员？

class LocalActor extends Actor {
  val remote = context.actorSelection("akka.tcp://HelloRemoteSystem@127.0.0.1:5150/user/RemoteActor")
  var counter = 0

  def receive = {
    case "START" =>
      remote ! "Hello from the LocalActor"
    case msg: String =>
      println(s"LocalActor received message: '$msg'")
      if (counter < 5) {
        sender ! "Hello back to you"
        counter += 1
      }
  }
}

我的遥控器看起来像

object Remote extends App {
  val system = ActorSystem("HelloRemoteSystem",ConfigFactory.load("remote"))
  val remoteActor = system.actorOf(Props[RemoteActor],name = "RemoteActor")
  remoteActor ! "The RemoteActor is alive"
}

class RemoteActor extends Actor {
  def receive = {
    case msg: String =>
      println(s"RemoteActor received message '$msg'")
      sender ! "Hello from the RemoteActor"
  }
}

我还想看一下remoteActor,这样如果死了,LocalActorSystem就知道了.所以我做了

val remote = context.actorSelection("akka.tcp://HelloRemoteSystem@127.0.0.1:5150/user/RemoteActor")
  context watch remote

但随后编译器失败并显示以下消息

题

>为什么我能够向ActorSelection发送消息,因为它不是Actor？
>我如何观看RemoteActor？

更新
但是,弃用的API不会抱怨

val remote = context.actorFor("akka.tcp://HelloRemoteSystem@127.0.0.1:5150/user/RemoteActor")
  context watch remote